PSA: Wulfsbane is an extremely powerful item few people know about.
Struggling with a pinnacle boss? Slap this shield on your 2nd weapon set, hold the shield to block, block once, and now the boss takes 10% increased damage and deals 10% less damage until they die. Sadly, there is no debuff icon for this yet, but I tested hundreds of hits on a cruel boss and I'm happy to say it does indeed work, even if you block and take the shield off, the debuff is indeed permanent until they die.